Two Circles

brute force, data structures, implementation

Flow Control

data structures, dsu, implementation

Journey

data structures, divide and conquer, graphs, trees

Sequence Transformation

brute force, data structures, dp, implementation, math

Mahmoud and Ehab and the final stage

data structures, strings

Mages and Monsters

data structures, geometry

Codeforces Scoreboard

binary search, data structures, dp, geometry

MEX Tree Manipulation

data structures, trees

Two Rooted Trees

data structures, implementation, trees

MEXanization

data structures

Palindromic Doubles

*special problem, data structures, dp

Bakery

data structures, dsu

Cubes

data structures, dp, geometry, two pointers

Caramel Clouds

data structures, dp, sortings

Three Arrays

data structures

Digital Patterns

combinatorics, data structures, implementation, math

Subset Trick

binary search, data structures

Cheat and Win

bitmasks, data structures, games, trees

Phoenix and Bits

bitmasks, brute force, data structures, sortings

Speckled Band

data structures, divide and conquer, hashing, string suffix structures, strings

Significant Cups

*special problem, binary search, data structures, two pointers

Landmarks

data structures, dp

Just Kingdom

brute force, data structures, dfs and similar

Pebbles and Beads

data structures, geometry

Dune II: Battle For Arrakis

*special problem, data structures, greedy, math

The Third Grace

data structures, dp

Собачки и миски

data structures, greedy, sortings

Slalom

data structures, dp, sortings

Phoenix and Diamonds

binary search, data structures, sortings

The Fair Nut's getting crazy

data structures, implementation

Meta-universe

data structures

Berland.Taxi

data structures

Palindrome Addicts

data structures, strings

Impressive Harvesting of The Orchard

data structures

Bully Sort

data structures, math

Hopping Around the Array

data structures, dp

Take Metro

brute force, data structures, graphs

Lucky Pair

combinatorics, data structures, implementation

Managing Telephone Poles

data structures, geometry

Holy Diver

data structures

Stations

data structures

Tape Programming

data structures, implementation

Antifibonacci Cut

bitmasks, combinatorics, constructive algorithms, data structures, dp, hashing, math

Sasha and a Patient Friend

binary search, data structures, implementation

Two Subtrees

data structures, trees

Secret Letters

data structures, dp, greedy

Prefix Max Set Counting

data structures, dp, trees

Ball-Stackable

constructive algorithms, data structures, dp, trees

Santa's Gift

data structures, trees

Looking for Owls

binary search, data structures, geometry, hashing, sortings

Ants

2-sat, data structures, trees

Range Diameter Sum

data structures, trees

Local Deletions

binary search, data structures, implementation

Inverse Inversions

binary search, brute force, data structures

Nene and the Passing Game

constructive algorithms, data structures, dsu, graphs, sortings

Evaluate RBS

data structures, geometry, implementation, math, sortings

Fishingprince Plays With Array Again

brute force, data structures, geometry, math

The Fair Nut and Amusing Xor

data structures

Summer Oenothera Exhibition

data structures

K Paths

combinatorics, data structures, dp, fft, math

Train Tracks

data structures, trees

Jumping Through the Array

binary search, data structures, graphs, two pointers

Chess Team Forming

*special problem, binary search, data structures, greedy

Iron Man

data structures, geometry, trees

My Beautiful Madness

data structures, trees

Line Distance

binary search, data structures, geometry

Greedy Elevator

data structures, implementation

Split

binary search, data structures, dp, greedy

Listening to Music

constructive algorithms, data structures

Squares

constructive algorithms, data structures, dp, graphs, trees

Feeling Good

bitmasks, data structures

Sasha and Algorithm of Silence's Sounds

data structures, trees

No Monotone Triples

data structures

A Certain Magical Party

combinatorics, data structures, greedy, sortings

MCMF?

data structures, flows, graphs, greedy, sortings, two pointers

Frequency Mismatch (Hard Version)

binary search, data structures, dfs and similar, hashing, probabilities, trees

The Potion of Great Power

*special problem, 2-sat, binary search, data structures, graphs, interactive, sortings, two pointers

Heroes of Making Magic III

data structures

Permutation for Burenka

data structures, graph matchings, greedy, math, trees

Palindromic Problem

binary search, data structures, hashing, string suffix structures, strings

Nauuo and ODT

data structures

Alien DNA

data structures, dsu, trees

Strange Permutation

binary search, combinatorics, data structures, dp, graphs, implementation, two pointers

Tricky Password

data structures

Sereja and Dividing

data structures

Median Mountain Range

data structures

Rainbow Rectangles

data structures, sortings, two pointers

Minimize Inversions Number

data structures, greedy, math, sortings

Mirror Room

data structures, implementation

Eye-Pleasing City Park Tour

data structures, trees

Triameter

binary search, data structures, dfs and similar, trees

Sharti

data structures, games

Perfect Matching

data structures, divide and conquer, interactive, trees

Reindeer Games

binary search, constructive algorithms, data structures, divide and conquer, flows, graphs, shortest paths

Boring Card Game

data structures, greedy, trees

Beautiful Tree

data structures, dfs and similar, graphs, implementation, trees

Gates to Another World

bitmasks, data structures, dsu, two pointers

New Year and Social Network

data structures, graph matchings, graphs, math, trees

Tree or not Tree

data structures, divide and conquer, implementation, trees

Omkar and Tours

data structures, divide and conquer, sortings, trees